Photocarrier dynamics in undoped and Na-doped Cu2ZnSnS4 single crystals revealed by ultrafast time-resolved terahertz spectroscopy

Le Quang Phuong; Makoto Okano; Genki Yamashita; Masaya Nagai; Masaaki Ashida; Akira Nagaoka; Kenji Yoshino; Yoshihiko Kanemitsu

doi:10.7567/APEX.8.062303

Photocarrier dynamics in undoped and Na-doped Cu₂ZnSnS₄ single crystals revealed by ultrafast time-resolved terahertz spectroscopy

Le Quang Phuong, Makoto Okano, Genki Yamashita, Masaya Nagai, Masaaki Ashida, Akira Nagaoka, Kenji Yoshino, Yoshihiko Kanemitsu

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

We investigated the effects of sodium doping on the photocarrier dynamics in Cu₂ZnSnS₄ (CZTS) single crystals using optical pump-THz probe transient reflectivity (THz-TR) and time-resolved photoluminescence (PL) spectroscopy. The THz-TR and PL decay dynamics are influenced by sodium doping, and their sodium-induced changes are consistent with each other. These time-resolved measurements revealed that the lifetime of photocarriers increases with sodium doping. This result indicates that a part of defects is suppressed by doping sodium into CZTS and implies that sodium doping improves the charge transport properties of CZTS, leading to an improvement in the performance of CZTS-based solar cells.

Original language	English
Article number	062303
Journal	Applied Physics Express
Volume	8
Issue number	6
DOIs	https://doi.org/10.7567/APEX.8.062303
Publication status	Published - 2015 Jun 1
Externally published	Yes

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Photocarrier dynamics in undoped and Na-doped Cu2ZnSnS4 single crystals revealed by ultrafast time-resolved terahertz spectroscopy",

abstract = "We investigated the effects of sodium doping on the photocarrier dynamics in Cu2ZnSnS4 (CZTS) single crystals using optical pump-THz probe transient reflectivity (THz-TR) and time-resolved photoluminescence (PL) spectroscopy. The THz-TR and PL decay dynamics are influenced by sodium doping, and their sodium-induced changes are consistent with each other. These time-resolved measurements revealed that the lifetime of photocarriers increases with sodium doping. This result indicates that a part of defects is suppressed by doping sodium into CZTS and implies that sodium doping improves the charge transport properties of CZTS, leading to an improvement in the performance of CZTS-based solar cells.",

author = "Phuong, {Le Quang} and Makoto Okano and Genki Yamashita and Masaya Nagai and Masaaki Ashida and Akira Nagaoka and Kenji Yoshino and Yoshihiko Kanemitsu",

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doi = "10.7567/APEX.8.062303",

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T1 - Photocarrier dynamics in undoped and Na-doped Cu2ZnSnS4 single crystals revealed by ultrafast time-resolved terahertz spectroscopy

AU - Phuong, Le Quang

AU - Okano, Makoto

AU - Yamashita, Genki

AU - Nagai, Masaya

AU - Ashida, Masaaki

AU - Nagaoka, Akira

AU - Yoshino, Kenji

AU - Kanemitsu, Yoshihiko

PY - 2015/6/1

Y1 - 2015/6/1

N2 - We investigated the effects of sodium doping on the photocarrier dynamics in Cu2ZnSnS4 (CZTS) single crystals using optical pump-THz probe transient reflectivity (THz-TR) and time-resolved photoluminescence (PL) spectroscopy. The THz-TR and PL decay dynamics are influenced by sodium doping, and their sodium-induced changes are consistent with each other. These time-resolved measurements revealed that the lifetime of photocarriers increases with sodium doping. This result indicates that a part of defects is suppressed by doping sodium into CZTS and implies that sodium doping improves the charge transport properties of CZTS, leading to an improvement in the performance of CZTS-based solar cells.

AB - We investigated the effects of sodium doping on the photocarrier dynamics in Cu2ZnSnS4 (CZTS) single crystals using optical pump-THz probe transient reflectivity (THz-TR) and time-resolved photoluminescence (PL) spectroscopy. The THz-TR and PL decay dynamics are influenced by sodium doping, and their sodium-induced changes are consistent with each other. These time-resolved measurements revealed that the lifetime of photocarriers increases with sodium doping. This result indicates that a part of defects is suppressed by doping sodium into CZTS and implies that sodium doping improves the charge transport properties of CZTS, leading to an improvement in the performance of CZTS-based solar cells.

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Photocarrier dynamics in undoped and Na-doped Cu₂ZnSnS₄ single crystals revealed by ultrafast time-resolved terahertz spectroscopy

Abstract

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